20611112521 has 16 divisors (see below), whose sum is σ = 21783283200. Its totient is φ = 19463083200.

The previous prime is 20611112519. The next prime is 20611112527. The reversal of 20611112521 is 12521111602.

It is a cyclic number.

It is not a de Polignac number, because 20611112521 - 2¹ = 20611112519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20611112492 and 20611112501.

It is not an unprimeable number, because it can be changed into a prime (20611112527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 798016 + ... + 823438.

It is an arithmetic number, because the mean of its divisors is an integer number (1361455200).

Almost surely, 2^20611112521 is an apocalyptic number.

It is an amenable number.

20611112521 is a deficient number, since it is larger than the sum of its proper divisors (1172170679).

20611112521 is a wasteful number, since it uses less digits than its factorization.

20611112521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25896.

The product of its (nonzero) digits is 240, while the sum is 22.

The spelling of 20611112521 in words is "twenty billion, six hundred eleven million, one hundred twelve thousand, five hundred twenty-one".